1/*
2 * Copyright (c) 2007, 2017, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24import java.net.*;
25import java.util.*;
26import java.io.IOException;
27
28/**
29 * Helper class for multicasting tests.
30 */
31
32class NetworkConfiguration {
33
34    private Map<NetworkInterface,List<InetAddress>> ip4Interfaces;
35    private Map<NetworkInterface,List<InetAddress>> ip6Interfaces;
36
37    private NetworkConfiguration(Map<NetworkInterface,List<InetAddress>> ip4Interfaces,
38                                 Map<NetworkInterface,List<InetAddress>> ip6Interfaces)
39    {
40        this.ip4Interfaces = ip4Interfaces;
41        this.ip6Interfaces = ip6Interfaces;
42    }
43
44    Iterable<NetworkInterface> ip4Interfaces() {
45        return ip4Interfaces.keySet();
46    }
47
48    Iterable<NetworkInterface> ip6Interfaces() {
49        return ip6Interfaces.keySet();
50    }
51
52    Iterable<InetAddress> ip4Addresses(NetworkInterface nif) {
53        return ip4Interfaces.get(nif);
54    }
55
56    Iterable<InetAddress> ip6Addresses(NetworkInterface nif) {
57        return ip6Interfaces.get(nif);
58    }
59
60    private static final boolean isMacOs =
61            System.getProperty("os.name").equals("Mac OS X");
62
63    static NetworkConfiguration probe() throws IOException {
64        Map<NetworkInterface,List<InetAddress>> ip4Interfaces =
65            new HashMap<NetworkInterface,List<InetAddress>>();
66        Map<NetworkInterface,List<InetAddress>> ip6Interfaces =
67            new HashMap<NetworkInterface,List<InetAddress>>();
68
69        // find the interfaces that support IPv4 and IPv6
70        List<NetworkInterface> nifs = Collections
71            .list(NetworkInterface.getNetworkInterfaces());
72        for (NetworkInterface nif: nifs) {
73            // ignore intertaces that are down or don't support multicast
74            if (!nif.isUp() || !nif.supportsMulticast() || nif.isLoopback()
75                || (isMacOs && nif.getName().contains("awdl")))
76                continue;
77
78            List<InetAddress> addrs = Collections.list(nif.getInetAddresses());
79            for (InetAddress addr: addrs) {
80                if (!addr.isAnyLocalAddress()) {
81                    if (addr instanceof Inet4Address) {
82                        List<InetAddress> list = ip4Interfaces.get(nif);
83                        if (list == null) {
84                            list = new LinkedList<InetAddress>();
85                        }
86                        list.add(addr);
87                        ip4Interfaces.put(nif, list);
88                    } else if (addr instanceof Inet6Address) {
89                        List<InetAddress> list = ip6Interfaces.get(nif);
90                        if (list == null) {
91                            list = new LinkedList<InetAddress>();
92                        }
93                        list.add(addr);
94                        ip6Interfaces.put(nif, list);
95                    }
96                }
97            }
98        }
99        return new NetworkConfiguration(ip4Interfaces, ip6Interfaces);
100    }
101}
102